The Pass Through Lower Boundary register specifies the lower boundary (exclusively) of pass through window.
Important: Note that in pass through window registers,
the left and top boundaries are inclusive while the right and bottom are exclusive.
For example, to pass though a top-left 720P window, these four registers should be
set to (0, 0, 1280, 720), respectively, rather than (0, 0, 1279, 719).